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ASTM ER Standard Test Method for Determination of Hydrogen in Titanium and Titanium Al_材料科学_工程科技_专业资料。. ASTM E() Standard Test Method for Determination of Hydrogen in Titanium and Titanium Alloys by Inert Gas Fusion Thermal Conductivity/Infrared. Buy ASTM E TEST METHOD FOR DETERMINATION OF HYDROGEN IN TITANIUM AND TITANIUM ALLOYS BY INERT GAS.

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Standard Test Method f ASTM D A number in parentheses indicates the year of last reapproval. No other units of measurement are included in this standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

E144 edition approved Aug. Originally approved in Last previous edition approved in as E — Summary of Test Method 4. Hydrogen present in the sample is released as molecular hydrogen into the?

The hydrogen is separated from other liberated gases such as carbon monoxide and? It is assumed that all who use this test method will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that the work will be performed in a properly equipped laboratory.

Several models of commercial analyzers are available and presently in use in industry. Each has its own unique design characteristics and operational requirements.

Use the astmm crucibles recommended by the manufacturer of the instrument.

Chemical Testing

Reagents and Materials 8. NOTE 2—Carrier gases vary by instrument model and include highpurity argon, nitrogen, and helium. Other methods, such as turning down on a lathe, may be employed for reducing sample size and removing the surface of the sample E147 3.

Rinse the sample in acetone, and air dry. Weigh to 6 0. Samples shall be handled only with tweezers or forceps after cleaning and weighing to prevent contamination.

NOTE 3—Regardless of the method used, the sample must not be allowed to overheat, as this will adversely affect the results of the analysis. Indications that the sample has overheated while being ashm may include discoloration of the metal or the sample becoming too hot to handle without tools. In this case instrument response must always be veri? Preparation of Apparatus Make a minimum of two determinations using a specimen as w1447 in Specimens must be of an appropriate size to?


For specimens of unknown 2 Use a fresh crucible each time. This mechanism will electronically compensate for the blank value. NOTE 7—If the unit does not have this function, the average blank must be subtracted from the total result. This titanium hydrogen reference material should have a hydrogen content greater than or approximately equal to the unknown samples within the scope of this test method 0.

Analyze at least three reference material specimens to determine the calibration slope Note 8. Treat each specimen as directed in NOTE 9—Some instruments have expanded computer capabilities that allow multi-point calibration which may improve the accuracy and precision of the calibration over the single-point calibration methodology as tested in the current interlaboratory study ILS.

The ILS used an acceptance criterion where the value fell within the allowable limits of the certi? An alternate procedure can be implemented where this value should agree with the certi?

The prediction interval is de? If the prediction interval does not encompass the certi? Either acceptance limit atm is acceptable for routine operation.

The accuracy of this test method is largely dependent upon the absence of bias in the hydrogen values assigned to the reference materials and upon the homogeneity of these materials.

Chemical Testing at WMT&R Inc.

Calculate the average and standard deviation s of these results. In the absence of bias among the reference materials, the average result for this reference material should agree with the certi?

This prediction interval may be calculated using Eq 1 and the s and n values for the mid-range reference material. NOTE 13—Commercially available reference materials are not always available at the concentration required to have r1447 true mid-point check.

The mid-range material must have a hydrogen concentration that is above the limit of detection, but below that of the high calibration point, preferably as close to the mid-point of the calibration curve as possible. NOTE 14—Typically, repeatability standard deviation is a function of the concentration of the analyte. If your results are not comparable, investigate and correct the cause. NOTE 15—The presence of bias between the reference material used in This cannot be corrected by making adjustments to the instrument.


Sm, there is evidence that the repeatability of the particular instrument is not acceptable for use with this test method. The user should determine and correct the cause, and repeat The acceptance range for the veri?

If a continuing calibration veri? Results must be supported by acceptable preceding and subsequent veri? D Standard Reference Material: E Standard Reference Material under development: National Institute of Standards and Technology. Material is in chip form. NOTE 16—If the analyzer does not offer these functions, calculate the hydrogen content by the following method: Dial the sample weight or a multiple of the sample weight on the weight compensator and use the where: Precision and Bias The data are presented in Table 1.

The testing and statistical analysis were performed in accordance with the provisions of Practice E, Plan A. Six instruments were of the thermal conductivity hydrogen measurement system con?

Calibration was performed utilizing a single calibration material NBS? The accuracy of this test method may be judged by comparing the results obtained from certi? ASTM E447 takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by asgm responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have r1447 received a fair hearing you should make your views known r1447 the ASTM Committee on Standards, at the address shown below.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.